174 Stewart— Mollusc a of the Boulder Clay. 



Chiton marmoreus, Fabricius. 

 Ballyrudder, S. A. S. 



Emarginula fissura, Linn. 

 Belfast Waterworks, Bryce. 



Trochus tumidus, Montagu. 

 Belfast Waterworks, Bryce. 



Lacuna pallidula, Da Costa. 

 Belfast Waterworks, Bryce. 



LACUNA divaricata, Fabricius. 

 Ballyrudder, S. A. S. 



LlTTORINA LITOREA, Linn. 



Belfast Waterworks, Bryce. 



TURRITELLA TEREBRA, Linn. 



Belfast Waterworks, Bryce; Knock and Ballyrudder, S. A. S. ; Bovevagh, 

 Co. Derry, Portlock. This is a rare shell in our Boulder Clay, except at 

 Bovevagh, where I found it abundant in one spot, as recorded by General 

 Portlock. 



TURRITELLA EROSA, Couthouy. 



Ballyrudder, Co. Antrim, Jeffreys and Hyndman. 



Natica Montacuti, Forbes. 



Ballyrudder, Co. Antrim, Jeffreys and Hyndman. 



Natica affinis, Gmelin. 



Belfast Waterworks, Bryce : Ballyrudder, S. A. S. 



Aporrhais pes-pelicani, Linn. 

 Belfast Waterworks, Bryce. 



